/**
 *  这是一个数字步进器的工具
 **/
layui.define(['jquery'], function (exports) {
  var $ = layui.jquery;

  var CountUp = function (argums, startNum, endNum) {
    /**
     *  用法1.当argums是JSON对象
     *  方法的startNum,endNum这两个参数无效
     *  eg: var Count = new CountUp({target:$(".box")});
     *          Count.start();
     *   argums{
                 target ： 目标元素
                 startVal ： 你想要开始的值，默认值为0
                 endVal ： 你想要到达的值，默认值为元素的值
                 decimals ： 小数位数，默认值为0
                 duration ： 动画持续时间为秒，默认值为2
                 options ：选项的可选对象
     *  }
     *  用法2.当argums为字符串或者为jq元素（推荐是JQ元素哦,也可以是dom元素）
     *  eg: var box = new CountUp(".box");
     *      box.start();//开始执行
     *  为字符串一定是个元素的JQ选择器
     *  startNum：默认值0
     *  endNum：默认值为元素的值
     */
    if ((typeof argums == "string") || (argums instanceof $) || (argums instanceof HTMLElement)) {
      var temp = argums;
      startNum = startNum || 0;
      endNum = endNum || $($(argums.target)[0]).text();
      argums = {
        target: $(argums)[0],
        startVal: startNum,
        endVal: endNum,
      }
    }
    argums.startVal = argums.startVal || 0;
    argums.target = $(argums.target)[0];
    argums.endVal = argums.endVal || $($(argums.target)[0]).text();
    /*var {
        target,
        startVal,
        endVal,
        decimals,
        duration,
        options
    } = argums;// 这里是ES6语法*/
    var target = argums.target,
      startVal = argums.startVal,
      endVal = argums.endVal,
      decimals = argums.decimals,
      duration = argums.duration,
      options = argums.options;
    var self = this;
    self.version = function () {
      return "1.9.2"
    };
    self.options = {
      useEasing: true,
      useGrouping: true,
      separator: ",",
      decimal: ".",
      easingFn: easeOutExpo,
      formattingFn: formatNumber,
      prefix: "",
      suffix: "",
      numerals: []
    };

    if (options && typeof options === "object") {
      for (var key in self.options) {
        if (options.hasOwnProperty(key) && options[key] !== null) {
          self.options[key] = options[key]
        }
      }
    }
    if (self.options.separator === "") {
      self.options.useGrouping = false
    } else {
      self.options.separator = "" + self.options.separator
    }
    var lastTime = 0;
    var vendors = ["webkit", "moz", "ms", "o"];
    for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
      window.requestAnimationFrame = window[vendors[x] + "RequestAnimationFrame"];
      window.cancelAnimationFrame = window[vendors[x] + "CancelAnimationFrame"] || window[vendors[x] +
      "CancelRequestAnimationFrame"]
    }
    if (!window.requestAnimationFrame) {
      window.requestAnimationFrame = function (callback, element) {
        var currTime = new Date().getTime();
        var timeToCall = Math.max(0, 16 - (currTime - lastTime));
        var id = window.setTimeout(function () {
          callback(currTime + timeToCall)
        }, timeToCall);
        lastTime = currTime + timeToCall;
        return id
      }
    }
    if (!window.cancelAnimationFrame) {
      window.cancelAnimationFrame = function (id) {
        clearTimeout(id)
      }
    }

    function formatNumber(num) {
      num = num.toFixed(self.decimals);
      num += "";
      var x, x1, x2, x3, i, l;
      x = num.split(".");
      x1 = x[0];
      x2 = x.length > 1 ? self.options.decimal + x[1] : "";
      if (self.options.useGrouping) {
        x3 = "";
        for (i = 0, l = x1.length; i < l; ++i) {
          if (i !== 0 && ((i % 3) === 0)) {
            x3 = self.options.separator + x3
          }
          x3 = x1[l - i - 1] + x3
        }
        x1 = x3
      }
      if (self.options.numerals.length) {
        x1 = x1.replace(/[0-9]/g, function (w) {
          return self.options.numerals[+w]
        });
        x2 = x2.replace(/[0-9]/g, function (w) {
          return self.options.numerals[+w]
        })
      }
      return self.options.prefix + x1 + x2 + self.options.suffix
    }

    function easeOutExpo(t, b, c, d) {
      return c * (-Math.pow(2, -10 * t / d) + 1) * 1024 / 1023 + b
    }

    function ensureNumber(n) {
      return (typeof n === "number" && !isNaN(n))
    }

    self.initialize = function () {
      if (self.initialized) {
        return true
      }
      self.error = "";
      // self.d = (typeof target === "string") ? document.getElementById(target) : target;
      self.d = target;
      if (!self.d) {
        self.error = "[CountUp] target is null or undefined";
        return false
      }
      self.startVal = Number(startVal);
      self.endVal = Number(endVal);
      if (ensureNumber(self.startVal) && ensureNumber(self.endVal)) {
        self.decimals = Math.max(0, decimals || 0);
        self.dec = Math.pow(10, self.decimals);
        self.duration = Number(duration) * 1000 || 2000;
        self.countDown = (self.startVal > self.endVal);
        self.frameVal = self.startVal;
        self.initialized = true;
        return true
      } else {
        self.error = "[CountUp] startVal (" + startVal + ") or endVal (" + endVal + ") is not a number";
        return false
      }
    };
    self.printValue = function (value) {
      var result = self.options.formattingFn(value);
      if (self.d.tagName === "INPUT") {
        this.d.value = result
      } else {
        if (self.d.tagName === "text" || self.d.tagName === "tspan") {
          this.d.textContent = result
        } else {
          this.d.innerHTML = result
        }
      }
    };
    self.count = function (timestamp) {
      if (!self.startTime) {
        self.startTime = timestamp
      }
      self.timestamp = timestamp;
      var progress = timestamp - self.startTime;
      self.remaining = self.duration - progress;
      if (self.options.useEasing) {
        if (self.countDown) {
          self.frameVal = self.startVal - self.options.easingFn(progress, 0, self.startVal - self.endVal,
            self.duration)
        } else {
          self.frameVal = self.options.easingFn(progress, self.startVal, self.endVal - self.startVal,
            self.duration)
        }
      } else {
        if (self.countDown) {
          self.frameVal = self.startVal - ((self.startVal - self.endVal) * (progress / self.duration))
        } else {
          self.frameVal = self.startVal + (self.endVal - self.startVal) * (progress / self.duration)
        }
      }
      if (self.countDown) {
        self.frameVal = (self.frameVal < self.endVal) ? self.endVal : self.frameVal
      } else {
        self.frameVal = (self.frameVal > self.endVal) ? self.endVal : self.frameVal
      }
      self.frameVal = Math.round(self.frameVal * self.dec) / self.dec;
      self.printValue(self.frameVal);
      if (progress < self.duration) {
        self.rAF = requestAnimationFrame(self.count)
      } else {
        if (self.callback) {
          self.callback()
        }
      }
    };
    self.start = function (callback) {
      if (!self.initialize()) {
        return
      }
      self.callback = callback;
      self.rAF = requestAnimationFrame(self.count)
    };
    self.pauseResume = function () {
      if (!self.paused) {
        self.paused = true;
        cancelAnimationFrame(self.rAF)
      } else {
        self.paused = false;
        delete self.startTime;
        self.duration = self.remaining;
        self.startVal = self.frameVal;
        requestAnimationFrame(self.count)
      }
    };
    self.reset = function () {
      self.paused = false;
      delete self.startTime;
      self.initialized = false;
      if (self.initialize()) {
        cancelAnimationFrame(self.rAF);
        self.printValue(self.startVal)
      }
    };
    self.update = function (newEndVal) {
      if (!self.initialize()) {
        return
      }
      newEndVal = Number(newEndVal);
      if (!ensureNumber(newEndVal)) {
        self.error = "[CountUp] update() - new endVal is not a number: " + newEndVal;
        return
      }
      self.error = "";
      if (newEndVal === self.frameVal) {
        return
      }
      cancelAnimationFrame(self.rAF);
      self.paused = false;
      delete self.startTime;
      self.startVal = self.frameVal;
      self.endVal = newEndVal;
      self.countDown = (self.startVal > self.endVal);
      self.rAF = requestAnimationFrame(self.count)
    };
    if (self.initialize()) {
      self.printValue(self.startVal)
    }
  };

  exports('miniCountUp', CountUp);
});
